Hendecasyllabic is a word that describes a line of verse with eleven syllables. It's a unique word, but if you're looking for synonyms, there are a few options. One alternative is "undecimal," which means "having eleven elements or parts." "Eleven-syllable" is also an option, although it's not as elegant as hendecasyllabic. "Undecasyllabic" is another term that means the same thing, but it's not as commonly used as hendecasyllabic. "Endecasyllabic" is also a synonym for hendecasyllabic and is used to describe lines in ancient Greek and Latin poetry. Regardless of the word you choose, each alternative implies the beauty and subtle complexity inherent in hendecasyllabic verse.